Voltage reactive distribution type control method making substation and power distribution network being harmonious

Abstract

The invention provides a voltage reactive distribution type control method making a substation and a power distribution network being harmonious. The voltage reactive distribution type control method comprises the steps that firstly, voltage reactive state information of the substation and voltage reactive state information of a reactive compensation device of the power distribution network subordinate to the substation are collected in real time through a wide area measuring information system, and the switching state information of the reactive compensation device is controlled; secondly, whether the substation and the power distribution network meet respective examination requirements is judged according to the voltage reactive state information of the substation and the power distribution network; finally, a preset substation and power distribution network harmony control strategy is executed according to an examination and evaluation result of the substation and the power distribution network. According to the voltage reaction distribution type control method, only the voltage reactive state information of a part of devices in the power distribution network is collected, the operation states of the substation and the power distribution network can be accurately judged through sensitivity calculation, the data volume of real-time collection and the data volume of calculation are small, the calculation speed is high, the installation cost and the operation and maintenance cost of a collecting and controlling device is small, the practicability is high, and application and popularization are convenient.

Description

technical field [0001] The present invention relates to the technical field of coordinated control between power system substations and distribution networks, and more specifically, relates to a coordinated control of power system terminal 110kV (or 35kV) substations and their lower-level distribution networks for coordinated control of voltage and reactive power distributed control method. Background technique [0002] At present, the control criterion of the voltage and reactive power control equipment installed in the terminal 110kV (or 35kV) substation of the power system and its lower-level distribution network is only independently controlled according to the real-time measurement data at the installation point. The taps of the main transformer in the substation The adjustment of the stalls is only judged based on the actual measured voltage on the outlet side of the substation. The switching of reactive power compensation equipment in the substation is only judged bas...

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Problems solved by technology

[0006] 1) This method only reflects that when the low-voltage user exceeds the limit, the voltage and reactive power adjustment equipment of the substation, line and distribution transformer can be adjusted to improve the voltage of the low-voltage user, but it does not reflect how the substation voltage reactive power exceeds the limit and cannot be adjusted. How to improve the voltage and reactive power state of the substation by adjusting the voltage and reactive power equipment in the distribution network, and how to further reduce the network loss when the voltage and reactive power of the substation and the distribution network do not exceed the limit;

[0007] 2) This method first judges and adjusts the voltage state, and then judges and adjusts the reactive power state after the voltage adjustment is completed. However, in the actual power system, voltage and reactive power are coupled to each other and cannot be adjusted separately;

[0008] 3) The three-level voltage and reactive power coordination control strategy formulated by this method does not take into account the substation main transformer tap position and the daily action limit of the substation capacitor bank, which may cause the main transformer tap position and the substation capacitor bank action times to exceed the limit ;

[0009] 4) This method requires real-time measurement of the low-voltage user voltage of the entire distribution network, the reactive power status of the distribution transformer voltage, the voltage regulator voltage, the voltage reactive power status of the main transformer, and the voltage reactive power control equipment status of the substation, line and all distribution transformers Information, for the distribution network, the installation quantity of its measurement devices and control devices is quite large, which brings relatively large installation costs and operation and maintenance costs, and is not generally applicable to the actual large-scale distribution network

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